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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.geom.Area;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class CombiningShapes extends JComponent {
private Shape mShapeOne, mShapeTwo;
private JComboBox mOptions;
public CombiningShapes() {
mShapeOne = new Ellipse2D.Double(40, 20, 80, 80);
mShapeTwo = new Rectangle2D.Double(60, 40, 80, 80);
setBackground(Color.white);
setLayout(new BorderLayout());
JPanel controls = new JPanel();
mOptions = new JComboBox(new String[] { "outline", "add",
"intersection", "subtract", "exclusive or" });
mOptions.addItemListener(new ItemListener() {
public void itemStateChanged(ItemEvent ie) {
repaint();
}
});
controls.add(mOptions);
add(controls, BorderLayout.SOUTH);
}
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
String option = (String) mOptions.getSelectedItem();
if (option.equals("outline")) {
// draw the outlines and return.
g2.draw(mShapeOne);
g2.draw(mShapeTwo);
return;
}
// Create Areas from the shapes.
Area areaOne = new Area(mShapeOne);
Area areaTwo = new Area(mShapeTwo);
// Combine the Areas according to the selected option.
if (option.equals("add"))
areaOne.add(areaTwo);
else if (option.equals("intersection"))
areaOne.intersect(areaTwo);
else if (option.equals("subtract"))
areaOne.subtract(areaTwo);
else if (option.equals("exclusive or"))
areaOne.exclusiveOr(areaTwo);
// Fill the resulting Area.
g2.setPaint(Color.orange);
g2.fill(areaOne);
// Draw the outline of the resulting Area.
g2.setPaint(Color.black);
g2.draw(areaOne);
}
public static void main(String[] args) {
JFrame f = new JFrame();
f.add(new CombiningShapes());
f.setSize(220, 220);
f.setVisible(true);
}
}
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